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April 24, 1928. 1,667,020

0. cs. WENDEL PRESSURE RESPONSIVB DEVICE Filed Sept. 2;. 1.921 2Sheets-$heet 1 In 0497270 2 orro a. WE/YfiEL April 24, 1928.

1,667,020 0. G. WENDEL PRES SURE RESPONS IVE DEVICE Filed Sept. 21. 19212 Sfieets$heet 2 ll l A v I 3/ 231 0611 9% 7" 07'70 6. lVE/YPEL PatentedApr. 24, 1928".

UNITED STATES ream-2a PATENT orrics,

OTTO G. WENDEL, OF BUFFALO, NEW YORK, ASSI GNQB T0 AMERICAN RADIATORCOMPANY, OF CHICAGO, IIJLIiioIs,

A CORBORATION OF NEW JERSEY.

PRESSURE-RESPONSIVE nE'vrcE.

Application filed September 21, 921. serrate- ,23

lViyim-ention relates to improvements in pressure responsive devices andis particularly applicable to the operation of electric switches, andthe same hasfor its object more particularly to provide a simple,efficient and reliable device especially adapted for controlling thecircuit of electrically heated boilers to maintain a givenpressure ortemperature of t-he'heating medium therein in order to render suchboilers available for testing radiato'rs,or other heatemitt-iugapparatus. f f

Further, said invention has fo'r'itsobject to provide acircuitcontrolling devicewhich is quickly responsive to variations incondi tions obtaining within a boiler orother heating apparatus.

Further, said invention has for its object to provide a device in whicha'movable member shall operate with a sudden or "snap actioninitsmovement. r

Further, said inventionhas for its'object to provide a circuitcontrolling device in which the circuit controlling member thereof isactuated by hammer blows imparted thereto. v I

Further, said invention has for'its object to prcvidea' circuitcontrolling device in which a hammerblow isirnpa'rted to a circuitcontrolling member to actuate the same by means of an arm having a snapmovement. 1 p Q' Further, said invention has for its object to provide asnap'actuated device in which, upon operation of the device the thrustof aspring finger is so directedas to impart a snap movement to-thedevicein either direction. v h

Further, said invention has for its object to provide a circuitcontrolling device tending to move into operative position, and held ninoperative position-and which is actuated by hammer blows applied by asnap action.

Other objects will in part be obvious and in part be pointedouthereinafter.

To theattainment of the aforesaid objects and endsmy invention consistsin the novel features of construction, and inthe combination. connectionand arrangement of parts hereinaftermore fully described and thenpointed out in the claims.

In the accompanying drawings formmg part of this specification Figure lis a longitudinal'sectional eleva tion showing one form'of circuitcontrolling device constructed according to and embodying mysaid'invention; the parts being shown in" cir'cuit closing position2is-a longitudinal sectional elevation,

as'in' Figured,\vith'the partsin open circuit positign;'" V Fig? 3 is aplan'view thereof; I

Fig' 4 is' an end? elevation thereof, looking towardsWli' circuit"controlling member, par s fbing 'oii ittedfand parts being'insect'i'oii' the parts shown-being in'circuit closing f ZFig. Sisa detaiLnd elevatio n of the circuit controlling'member illustrated in F isai'd' me iibe r"being: shown in open circuit positionif i: i. j In the"inbodiineiitillustrated "Ixprovide a p'ressur ij'espo is'ii'fe"devicecomprising a cylindrical enclosing c'asiii gl having itsjbottom closiedbyj ah d screw-threaded into the f fin pro dsd. th a h l o Stem 3screw-threaded at'i outer end to ien'gage in' th epres'siiie tank "otheapparatus? Arranged within'this casing 1 s an expausiblecollap sibleincmber 4 preferably comprising a "tubular 'wallf corrugated "and havingits loweigend closedby an integral head 5: .The upper of the'ltilbularwall is secured by bra zing soldering or fotherwise to the inner wall t3of the casing, a fluid tightjoint'being made at. this point. 'TheQcorrugated' wall and the cylinder 11 thus form a pressure chamber anddue to the fiexibility .of the corrugations of the wall the tubularmember 4 will expand a ndicollapse under variations of pressure admittedto the cylinder. Secured within the expansibl e-collapsible member 4 isa rigid disc]? receivingthe lower end of a stem 8, the upperend of whichmakes a slip joint'with a stemextension 9 projecting outwardly centrallythrough a covet-.10 closingthe upper endof casing l Pivot-ed betweenears 11 on cover 10 at one. sideof extension}? is rocker arm orlever 12."l he arni' 12 is pivoted on a horizontal axis 13 between its-endsand'lias a part extending horizontally over the cover 10 through a slot14in theextension' 9. The lever or arm--12 is counterbalanced by meansof a weight nounted uponthe arm or-lever 12 at the opp'osite sidejofpivot 13 PinsI5 and 16 are secured to member 9 transversely f l t, 14 dupon opposite sides of lever 12, being s ufligienttx gpaeett to mg'n i tl l 1() ment of Q1111. l'gb txy en them qp d arranged to move or operatearm 12 in opposite directions as the member 9 responds to ariations inpreiife. T1'1'etein of the efipineible collapsible 'i'neii'ib eroperates ginst z eoiled spring 17 one end of whielnbears upon a shoulder18 on a projection '19 of thee'xt e'nsioil f) and the other endbearsagainst a nut 20 on the threaded stem 21 sieoiired in the top hi s yoke,;zi s witl be noted, re x position to the casing 1 fia fi' hle. i$.-i nd-i p ally efies li-jai ii -fi2tthe-mi ie:e .ef.-.: 1i .i,=; ll. bmen i uyhereinafiter we; .qeedw iti ie.

bfia a? urc i 'ke x t 13519% gee pgvqiiz then 31 1511 12 as fstibs'ntial ly e-eta 14 beiii'fl" Vertically adjustable on post 16.

The leveqAi 4nd circuit eonti'otling memtmr secured thereto tend to dropby gravity into eire it. elosii ig position, w hen releab egl f i mmatch lemme-e :fP I QQJ A iikl l'sk pert fi ggpring i gei 19 arra edvertically}- 0n'ha efi -iin vigin 4. p nling r. 50 e iwsfit pnm thee-upenhe iio i t mnt 11. w the matr member. ziin] ion 32 38 which are ofcarbon and hence not easily injured, the latter thus protecting contacts31.

While I have illustrated and described one embodiment of my invention,it will be understood that various i'i'iodifications and changes may bemade therein without departing from the spirit of the invention as setforth in the appended claims.

Having thus described my invention, what .l claim as new and desire tosecure by Letters Patent is:

l. A device of the character described comprising a support. a. plungeradapted to be reciprocated relative to said support, a rocker armpivoted to said support at one side of-said plunger and extendingtransversely of said plunger between opposing portions of the same topermit of said plunger )ositively moving said arm back and forth; saidopposing portions being spaced to permit of a limited independentmovement of said arm between said opposing portions, and a snap actiondevice interposed between said arm and said support for imparting a snapmovementto said arm in one direction or the other depending on thedirection of movement of said plunger, substantially as specified.

2. A device of the character described comprising a support, a plunger.movable.

said arm for imparting a snap movementthereto in one direction ortheother depending on the direction of movement of-said plunger,substantially as specified.

3. A device of the character described comprising a support, a rockerarm having a slot therein pivoted to said support. a

spring secured to said support and extending .one direction or theopposite, depending on into said slot to provide a bearing at one end ofsaid spring. an opposing bearing onsaid arm within said slot, a memberdisposed within said slot. between said bearings and having notchesreceivingsaid bearings, and means for operating said arm, substantiallyas specified.

4. A device of the character described comprising a support, a plungeradapted to be reciprocated relatively to said support, a balanced rockerarm pivoted at one side of said plunger, extending transversely thereoiand having a lost motion connection therewith whereby said arm may bemoved back and forth by said plunger while permitting movement thereofrelatively to said plunger, cooperating bearings secured to said arm andsaid support; one of said bearings in eluding a spring, and an armactuating member interposed between said bearings and arranged to causesaid spring to impart a snap movement to said arm as said bearingsrelatively move out of alignment upon operation of said arm by saidplunger, substantially as specified.

5. A device of the character described comprising a support, areciprocating member mounted on said'support for movement in oppositedirections, a rocker arm pivoted to said support at one side of saidmember, and extending transversely of and having a lost motionconnection with said member, whereby said arm may be moved in oppositedirections thereby and independently thereof, and means interposedbetween said support and said arm -for imparting a snap movement to saidarm relatively to said reciprocating member when the former is moved bythe latter, substantially as specified. l I

6. A device o'f.the character described comprising a support, a pressureoperated plunger movable relatively to said support. anadjustablefispring for controlling the movement of said plunger'underpressure variations, abalanced rocker arm pivoted on said support at oneside of said plunger, ex-

tending transversely, across said plunger andhaving a lost motionconnection therewith, whereby-said. arm 'may be moved relatively t saidsupport. bysaid plunger while permitting independent movement thereof,said armhaving a slot therein at a point at the opposite side of saidplunger, a spring secured to said support and .having a finger extendingwithin said-slot.and constituting a bearing, a. cooperating: bearingsecured to said arm and-extending into said slot, and. an arm actuatingmember interposed between said bearings within said slot, having notchesupon opposite sides thereof receiving said bearings, .taking the thrustof said spring and arranged to be tilted in opposite directions todirect the thrust of said spring to impart a snap movement to said armin the direction of movement of said plunger, substantially asspecified.

7. A device of the character described comprising a pivoted circuitcontrolling member mounted for movement in opposite directions andhaving a weighted arm tending to drop by gravity into circuit closingposition, a spring detent for holding said member in elevated position,and means for imparting hammer blows to said member in oppositedirections, whereby to release said member and cause the same to dropinto circuit closing position and to return said member into engagementwith said detentto be retained in elevated position, substantially asspecified.

8 A device of the cha r described opera tive position, and snap actuatedinc z iis limiting the mo nng; 0

o er z ted plun er recipropc'iiiiiingl said; c'zis n (if if'btlhrib'dfokikerfarm pivoted mi sa d a inw-circiiiv confirming:member waeea;

